首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
For centuries men dreamed of achieving vertical flight. In 400 A.D. Chinese children played with a fan-like toy that spun upward
For centuries men dreamed of achieving vertical flight. In 400 A.D. Chinese children played with a fan-like toy that spun upward
admin
2016-04-03
30
问题
For centuries men dreamed of achieving vertical flight. In 400 A.D. Chinese children played with a fan-like toy that spun upwards and fell back to earth as rotation ceased. Leonardo da Vinci conceive the first mechanical【B1】______, called a "Helix," which could carry man straight up, but was only a design and was never tested.
The ancient-dream was finally realized in 1940 when a Russian engineer piloted a strange looking craft of steel tubing with a rotating fan【B2】______. It rose awkwardly and vertically into the air from a standing start, hovered a few feet above the ground, went 【B3】______ and backwards, and then settled back to earth. The vehicle was called a helicopter.
Imaginations were fired. Men dreamed of going to work in their own personal helicopters. People anticipated that vertical flight transports would carry millions of passengers as do the airliners of today. Such fantastic expectations were not【B4】______.
The helicopter has now become an extremely useful machine. It【B5】______ in military missions, carrying troops, guns and【B6】______ instruments where other aircraft cannot go. Corporations use them as airborne offices, many metropolitan areas use them in police work, construction and logging companies employ them in various【B7】______ ways, engineers use them for site selection and surveying, and oil companies use them as the best way to make offshore and remote work stations【B8】______ crews and supplies. Any urgent mission to a hard-to-get-to place is a likely task for a helicopter. Among their other 【B9】______ of use: deliver people across town, fly to and from airports, 【B10】______ rescue work, and aid in the search for missing or wanted persons.
【B1】
选项
答案
apparatus
解析
空格前的定冠词the和形容词mechani-cal提示,此处应填入名词。apparatus意为“器械”,注意双写p。
转载请注明原文地址:https://kaotiyun.com/show/qzG7777K
0
大学英语六级
相关试题推荐
Iamoneofthemanycitypeoplewhoarealwayssayingthatgiventhechoiceweshouldprefertoliveinthecountryawayfromt
Itmayseemridiculous,butinthehuntforsourcesofalternativeenergyresearchershavecomeupwithfuelcellswhicharepow
DespicableCharactersAreNewHeroesA)InfilmsandTVshows,despicablecharactersaretakingcentrestage.NicholasBarberinv
DespicableCharactersAreNewHeroesA)InfilmsandTVshows,despicablecharactersaretakingcentrestage.NicholasBarberinv
A、Sheisgoodatrepairingthings.B、Sheisaprofessionalmechanic.C、Sheshouldimproveherphysicalcondition.D、Shecannotg
A、Inabus.B、Inaclinic.C、InaboatD、Inaplane.C对话中女士首先提到了关键词seasick,意为“晕船的”,接下来男士对她说,先闭上眼睛放松一下,一会儿上岸就好了。由此可知,两个人现在正在船上,故答
A、Itmaintainstheregularsleeppattern.B、Itburnsouttheextraenergy.C、Itkeepspeopleingoodmoods.D、Ithelpsproducet
Themostcontroversialtopicsin【B1】______sportsmaybedruguse,butinyouthsports,notwowordsaremoreinflammatory(煽动性的)
A、Cleanupandrepairtheholebysilveralloyfilling.B、Cleanupandcoverthetoothwithaporcelaincrown.C、Pulloutofthe
It’sperhapstheworld’smostfamousunderwaterattraction,immortalizedinfilmandinlegend:theTitanic.Butnowexpertssay
随机试题
回火是将淬火钢加热到________某一温度,保温一定时间,然后冷却至室温的热处理工艺。
铁壳刀开关的常用型号有()。
管道系统试验的类型主要包括()试验。
招标人根据工程实际情况需要修改合同条款的内容,可以在()进行修改。
甲企业2010年取得了国库券投资的利息30000元,其他公司债券投资利息70000元,全年税前利润为690000元,所得税税率为25%。若无其他纳税调整项目,则2010年该企业的净利润为()元。
入住通知书、入住须知、用户手册、管理公约等是()。
遏制“屡教不改”,需要从多方面人手。对一再重犯的问题企业,不能简单地整改了事,要对相关负责人依法依规问责,纪委、监察、司法、公安等部门都要依法介入。有的企业是“你审你的计,我犯我的规”,甚至怀揣着“犯了再改、改了又犯”的心态,如果仅仅“罚酒三杯”,相关负责
假释的考验期限,从()起计算。
某实验室需购某种化工原料106千克,现在市场上该原料有两种包装,一种是每袋35千克,价格为140元;另一种是每袋24千克,价格为120元。在满足需要的条件下,最少要花费()元
在Internet中,不需运行IP协议的设备是()。
最新回复
(
0
)